Earthquake's ROCK-on outdoor speaker series is specifically designed to imitate a rock-like appearance and easily blend in with any outdoor environment. Made with UV treated, weather-resistant enclosure materials and durable epoxy resin construction, the ROCK-on speakers can withstand the demanding outdoor elements. Granite-52 is a pair of rock speakers with a 5.25-inch woofer and a 0.5-inch Mylar tweeter. They serve as your left and right speakers and have an amazing frequency response that is unmatched by any other rock speaker. They produce a clean and accurate sound. ROCK-on outdoor speakers are the ideal choice for listening to music in the garden, by the pool, in the yard, or on the patio.